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Catalyst for preparing butadiene by oxidative dehydrogenation of butene, its preparation method and use

A technology of catalysts and composite oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, physical/chemical process catalysts, etc. Issues such as uniform distribution of active ingredients

Active Publication Date: 2020-02-18
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for different metal ions, the pH value of precipitation is different, so the order of precipitation of metal ions is different during preparation, which is unfavorable for the uniform distribution of active components; Ions form soluble complexes, leading to the loss of active components, so it is difficult to precisely cont...

Method used

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  • Catalyst for preparing butadiene by oxidative dehydrogenation of butene, its preparation method and use

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preparation example Construction

[0048] 2. Preparation method of composite oxide catalyst

[0049] The preparation method of the composite oxide catalyst of the present invention is to add urea to the slurry after the first aging, then perform the second aging, and then dry, pulverize, shape and roast the obtained slurry to obtain the finished catalyst. This method The prepared composite oxide catalyst well overcomes the problem of low selectivity of the catalyst prepared in the prior art, and the preparation process of the present invention is simple and easy, the preparation repeatability is good, and the prepared catalyst has the advantage of good selectivity, especially Suitable for industrialized mass production.

[0050] Composite oxide catalyst of the present invention is to adopt the method for stepwise preparation to make, and it comprises the steps:

[0051] (1) Precursor compounds of elements Mo, Bi, M, and N metals are respectively dissolved according to the composition ratio of the above general...

Embodiment 1

[0076] Weigh 124 grams of ammonium heptamolybdate, dissolve in 400ml distilled water to form A solution; then weigh 56.4 grams of bismuth nitrate, 70.7 grams of iron nitrate, 136.8 grams of cobalt nitrate and 1.18 grams of potassium nitrate, dissolve in 100ml of distilled water to form B solution Solution: Dissolve 98.5 g of urea with 300 ml of distilled water to form C solution. The amount of urea in solution C is 1.64mol, the amount of three metal elements Bi, Fe, and Co in solution B is 0.82mol, and the ratio of the amount of substances is 2:1.

[0077] Under the condition of stirring, slowly add solution B to solution A, after the addition is completed, the slurry is aged at 70°C for 2 hours; then, solution C is slowly added to solution C under the condition of stirring, after the addition is completed The slurry was aged at 70°C for 2 hours. The aged slurry was dried in an air atmosphere at 140°C for 8 hours, and the water was completely evaporated to obtain a solid that...

Embodiment 2

[0094] Weigh 124 grams of ammonium heptamolybdate, dissolve in 400ml distilled water to form A solution; then weigh 28.2 grams of bismuth nitrate, 70.7 grams of iron nitrate, 154 grams of cobalt nitrate and 0.59 grams of potassium nitrate, dissolve in 100ml of distilled water to form B solution Solution: Dissolve 98.5 g of urea with 300 ml of distilled water to form C solution. The amount of urea in solution C is 1.64mol, the amount of three metal elements Bi, Fe, and Co in solution B is 0.82mol, and the ratio of the amount of substances is 2:1.

[0095] Under the condition of stirring, slowly add solution B to solution A, after the addition is completed, the slurry is aged at 70°C for 2 hours; then, solution C is slowly added to solution C under the condition of stirring, after the addition is completed The slurry was aged at 70°C for 4 hours. The aged slurry was dried in an air atmosphere at 140°C for 8 hours, and the water was completely evaporated to obtain a solid that w...

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Abstract

The invention discloses a catalyst for preparing butadiene by oxidative dehydrogenation of butene, a preparation method and an application thereof. The catalyst has the following structural general formula, wherein M is selected from V, Cr, Mn, Fe, Co, Ni, Cu or a mixture of two or more of V, Cr, Mn, Fe, Co, Ni and Cu in any proportion; N is selected from Na, K, Cs or a mixture of two or more of Na, K and Cs in any proportion; x is equal to 0.5-20; y is equal to 0.05-20; z is equal to 0.01-5; and a is a number meeting the valence state of each atom; the catalyst is prepared by the following steps: (1) separately dissolving precursor compounds of the elements Mo, Bi, M and N metal according to the component proportion of the general formula, adding the precursor solution of the Bi, M and N metal into the precursor solution of the Mo, and then aging the pulp; (2) adding an urea solution into the aged pulp, wherein in terms of mole, the ratio of the amount of the urea to the sum of the amounts of Bi and M in the pulp is 0.2-10; and conducting aging again: (3) adding graphite, and conducting granulating, tabletting and roasting to obtain the catalyst, BiMoxMyNzOa.

Description

technical field [0001] The invention relates to a composite oxide catalyst for preparing butadiene by oxidative dehydrogenation of butene, and the catalyst has high product selectivity. The invention also relates to a preparation method of the composite oxide catalyst and its application in the reaction of butadiene prepared by oxidative dehydrogenation of butene. Background technique [0002] Butadiene is a very important basic chemical raw material, the most used monomer in the synthetic rubber industry, and an important intermediate for the production of synthetic resins and organic chemical raw materials. [0003] At present, 90% of the butadiene in the Chinese mainland market is extracted from the by-products of naphtha cracking, but the current increase in domestic butadiene production cannot meet the growing demand for butadiene, and it is necessary to develop new non-butadiene Butadiene production process that relies on olefin cracking. The production of 1,3-butadi...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C5/48C07C11/167
CPCB01J23/002B01J23/8876B01J2523/00C07C5/48C07C2523/887B01J2523/13B01J2523/54B01J2523/68B01J2523/842B01J2523/845C07C11/167
Inventor 熊德胜王晓夏庄岩吴通好马建学钱志刚季金华
Owner SHANGHAI HUAYI NEW MATERIAL